HD404344R Datasheet, PDF (43/102 Pages) Renesas Technology Corp – 4-bit microcomputer has an A/D converter

HD404344R Series/HD404394 Series
Input/Output
The HD404344R series and HD4074344 MCU has 22 input/output pins (D₀–D₅, R0₀–R3₃) and the
HD404394 MCU has 21 input/output pins (D₀–D₅, R0₀–R2₃, R3₁–R3₃). These input/output pins have the
following features:
• All 22 pins for the HD404344R series and HD4074344 have a CMOS output circuit. Ten pins D₁, D₂,
and R1₀–R2₃ are large current input/output pins.
• Three input/output pins of the 21 pins on the HD404394 series, R1₀–R1₂, have intermediate-voltage
NMOS open drain output circuits. Five other input/output pins, R1₃ and R2₀–R2₃, have standard-voltage
NMOS open drain output circuits. The remaining 13 input/output pins, D₀–D₅, R0₀–R0₃ and R3₁–R3₃,
have CMOS output circuits.
Ten pins D₁, D₂, and R1₀–R2₃ are high-current input/output pins.
• Some input/output pins are multiplexed with peripheral functions, such as for the timers and serial
interface. For these pins, the settings for peripheral functions are done prior to the D or R ports settings.
If these pins are set as peripheral functions, the pin functions and input/output selections automatically
switch according to the settings.
• Program control of input/output port selection, as well as peripheral function selection.
• All peripheral function output pins are CMOS output pins. However, the R0₂/SO pin can be
programmed to be NMOS open drain output.
• In stop mode, all peripheral function selections are cleared because of the MCU being reset. Also, the
input/output pins go into a high-impedance state.
• All input/output pins for both the HD404344R series, HD4074344 and the HD404394 series except for
pins R1₀–R2₃, have built-in pull-up MOS. Therefore they can be individually turned on or off by
software.
• When pin functions are set as peripheral functions after selecting the pins as pull-up MOS, the pins are
maintained as pull-up MOS from the time of selection. Also, pull-up MOS can be selected by software
after setting the pin functions as peripheral functions. The control of the input/output pins are shown in
table 17 and the circuit configuration of each input/output pin is shown in table 18.
Table 17 Programmable Control of Standard I/O Pins
MIS3 (bit 3 of MIS)
DCD, DCR
PDR
CMOS buffer
PMOS
NMOS
Pull-up MOS
Note: — indicates off.
0
1
0
1
0
1
0
1
0
1
0
1
0
1
—
—
—
On
—
—
—
On
—
—
On
—
—
—
On
—
—
—
—
—
—
On
—
On
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